When representing decimals with base-ten blocks, what represents one-tenth in the following examples?
a. When a "tens" block represents the unit, 3 small units represents one- tenth.
b. When a "tens" block represents the unit, 9 small units represents one- tenth.
c. When a "tens" block represents the unit, 1 small unit represents one- tenth.
d. When a "tens" block represents the unit, one rod or long represents one- tenth.
c
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